feat: the server checks the grade against the files before approving

The price depends on the grade, which the browser worked out and the API
took on trust. Before a cart is approved at checkout the API now recomputes
it from the uploaded files by the Site's own rules: the pixel size in a
PNG, JPG or WebP header across the printed width (rotation included), and
the area-weighted DPI of the images placed in a PDF of up to 150 MB, 300
for vectors. Sheets take the worst grade, artworks the average. A claim more
than 2 points above the file's grade, or a discount on a file the server
cannot grade, waits for an operator, with the reason on the Kanban.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

app/runtime.py

@@ -85,7 +85,7 @@ def quote_view(c, row):
             'draft': row['draft'], 'approved': row['approved'],
             'status': 'paid' if order else 'expired' if expired else 'approved' if row['approved'] else 'pending_review',
             'auto_approved': row.get('reviewed_by') == 'auto',
-            'review_reason': None if row['approved'] else review_reason(row['draft']),
+            'review_reason': None if row['approved'] else (row.get('review_note') or review_reason(row['draft'])),
             'payment': attempt,
             'order': order}